Permeable, porous polymeric membrane with hydrophilic character,

Details Permeable, porous polymeric membrane with hydrophilic character, Permeable, porous polymeric membrane with hydrophilic character,

1989-07-03

1992-02-25

Spear, Frank

Liquid purification or separation

Filter

Supported, shaped or superimposed formed mediums

21050029, 21050037, B01D 6912

Patent

active

050910868

ABSTRACT:
Permeable, porous polymeric membrane with hydrophilic character of the membrane, said character being obtained by treatment with a solution comprising one or more hydrophilic, mono-or polymeric compounds selected among soluble, OH-containing cellulose derivatives, polyvinylalcohols and low molecular weight, polyfunctional, NH-and/or OH-containing compounds, optionally in the presence of a cross-linking agent, a surfactant and a initiator followed by rendering the layer deposited during the treatment insoluble on the membrane surface by means of a catalyst reaction at elevated temperatures in order to fixate the hydrophilic material to the membrane. Furthermore a process for the preparation of these membranes by means of treating a permeable, porous, polymeric membrane of hydrophobic character with the above solution in the presence of a catalyst and optionally in the presence of a cross-linking agent, a surfactant and an initiator, and curing of the coated membrane by means of heating to form an insoluble, hydrophilic surface layer. The membranes are suitable for use in ultra- and microfiltration.

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